---
page_type: error
code: 21404
message: "21404: Inbound Phone number not available to trial account"
level: ERROR
---

## Error - 21404

### Inbound phone numbers not available to trial accounts

Purchasing phone numbers is a feature that is only available for upgraded accounts. Please upgrade to a Full Twilio Account in order to purchase numbers.

You can upgrade from the [billing section](/user/billing) of your account portal.